People gather to watch images projected on the facade of St. Peter's Basilica, at the Vatican, Tuesday, December 8, 2015. The Vatican is lending itself to environmentalism with a special public art installation timed to coincide with the final stretch of climate negotiations in Paris. On Tuesday night, the facade of St. Peter's Basilica has been turned into a massive backdrop for a photo light show about nature organized by several humanitarian organizations. Organizers offered the installation as a gift to Francis to mark his Holy Year of Mercy, which began Tuesday. (Photo by Riccardo De Luca/AP Photo)
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